Ólafsdóttir, Anna H; Pampoulie, Christophe: Fish and invertebrate trawl sampling south and west of Iceland in July 2021 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.942987 (dataset in review)
Abstract:
This data set has trawl catch weight and biological measurements from the latter half of the Icelandic part of the International Ecosystem Summer Survey in Nordic Seas (IESSNS) conducted in July 2021. The survey area was from the coast and over the shelf edge south and west of Iceland, defined as IESSNS strata 5 and 6, see embedded map. The survey period was July 17 – 26, 2021, and samples were collected at 38 trawl stations. A specifically designed scientific trawl, called Multpelt832 (ICES 2013a-b, Valdemarsen et al. 2014) with cod-end mesh size of 50+ mm, was used at all 38 stations. Trawl depth ranged from surface (trawl headline in surface) at 22 stations and 8 stations was trawling deeper in the water column targeting specific acoustic backscatter with trawl depth of 100 – 400 m. All trawl catch was identified to lowest possible taxonomic level, total weight of each species recorded, and length and weight of 50 specimen per species measured, or all if less was caught. For blue whiting (Micromesistius poutassou), herring (Clupea harengus), and mackerel (Scomber scombrus) more biological measurements are provided such as sex, maturity, age, and stomach weight. For age determination, the otolith or scale was extracted whole from specimen at sea and read whole under a dissecting microscope on land by an experienced age reader part of the ICES framework. Gonad maturity stage was visually estimated at sea during sampling by an experienced technician. For taxa Scyphozoa and Natantia decapods only total catch weight per station is recorded. For detailed information about the survey see the survey report (Ólafsdóttir et al. 2022) in Icelandic and abstract, figure and table headings also provided in English. Various information about the trawling operation and weather is included in file. The data is provided by the Marine and Freshwater Research Institute (MFRI) in Iceland.
Keyword(s):
References:
International Council for the Exploration of the Sea (ICES) (2013): Report of the Working Group on Improving Use of Survey Data for Assessment and Advice (WGISDAA). Marine Institute, Dublin, Ireland. ICES CM 2013/SSGESST:07, 22 pp.
International Council for the Exploration of the Sea (ICES) (2013): Report of the Workshop on Northeast Atlantic Mackerel monitoring and methodologies including science and industry involvement (WKNAMMM). ICES Headquarters, Copenhagen and Hirtshals, Denmark. ICES CM 2013/SSGESST:18, 33 pp.
Ólafsdóttir, Anna H; Finnbogadóttir, Gudrún; Kennedy, James; Sigurgeirsdóttir, Sólrún; Aradóttir, Svandís Eva (2022): Results of the Icelandic part of the International Ecosystem Summer Survey in Nordic Seas (IESSNS) in July 2021 on R/V Árni Friðriksson. Marine and Freshwater Research Institute, Iceland, 40 pp., IESSNS_IS_2021.pdf
Valdemarsen, J W; Jacobsen, J A; Óskarsson, Guomundur J; Utne, Kjell Rong; Einarsson, H A; Sveinbjörnsson, Sveinn; Smith, L; Zachariassen, K; Nøttestad, Leif (2014): Swept area estimation of the North East Atlantic mackerel stock using a standardized surface trawling technique. Working Document (WD) to ICES WKPELA, 14 pp.
Further details:
Project(s):
Funding:
Coverage:
Median Latitude: 63.629048 * Median Longitude: -21.253948 * South-bound Latitude: 62.713500 * West-bound Longitude: -30.673000 * North-bound Latitude: 65.210667 * East-bound Longitude: -15.269000
Date/Time Start: 2021-07-17T00:46:00 * Date/Time End: 2021-07-26T00:43:00
Minimum DEPTH, water: 13.5 m * Maximum DEPTH, water: 329.0 m
Event(s):
A12-2021_323 * Latitude Start: 63.896000 * Longitude Start: -15.315000 * Latitude End: 63.868167 * Longitude End: -15.249667 * Date/Time Start: 2021-07-17T00:46:00 * Date/Time End: 2021-07-17T01:16:00 * Elevation Start: -108.0 m * Elevation End: -113.0 m * Mesh size: 50 mm * Location: Nordic Seas * Campaign: IESSNS_2021 (A12-2021) * Basis: Arni Fridriksson * Method/Device: Multipurpose pelagic trawl - 832 (MULTPELT-832)
A12-2021_324 * Latitude Start: 63.317333 * Longitude Start: -15.349167 * Latitude End: 63.278000 * Longitude End: -15.341167 * Date/Time Start: 2021-07-17T07:06:00 * Date/Time End: 2021-07-17T07:36:00 * Elevation Start: -1475.0 m * Elevation End: -1422.0 m * Mesh size: 50 mm * Location: Nordic Seas * Campaign: IESSNS_2021 (A12-2021) * Basis: Arni Fridriksson * Method/Device: Multipurpose pelagic trawl - 832 (MULTPELT-832)
A12-2021_325 * Latitude Start: 62.802667 * Longitude Start: -15.269000 * Latitude End: 62.863000 * Longitude End: -15.283500 * Date/Time Start: 2021-07-17T12:26:00 * Date/Time End: 2021-07-17T13:26:00 * Elevation Start: -1850.0 m * Elevation End: -1850.0 m * Mesh size: 50 mm * Location: Nordic Seas * Campaign: IESSNS_2021 (A12-2021) * Basis: Arni Fridriksson * Method/Device: Multipurpose pelagic trawl - 832 (MULTPELT-832)
Parameter(s):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | Event label | Event | Ólafsdóttir, Anna H | |||
2 | Country | Country | Ólafsdóttir, Anna H | |||
3 | Year of observation | Year obs | a AD | Ólafsdóttir, Anna H | ||
4 | Station label | Station | Ólafsdóttir, Anna H | |||
5 | Comment | Comment | Ólafsdóttir, Anna H | Trawl station type (Ptrawl = surface, DeepTrawl = watercolumn) | ||
6 | DATE/TIME | Date/Time | Ólafsdóttir, Anna H | Geocode – Trawl in water | ||
7 | DATE/TIME | Date/Time | Ólafsdóttir, Anna H | Geocode – Trawl out of water | ||
8 | LATITUDE | Latitude | Ólafsdóttir, Anna H | Geocode – Trawl in water | ||
9 | LONGITUDE | Longitude | Ólafsdóttir, Anna H | Geocode – Trawl in water | ||
10 | Latitude 2 | Latitude 2 | Ólafsdóttir, Anna H | Trawl out of water | ||
11 | Longitude 2 | Longitude 2 | Ólafsdóttir, Anna H | Trawl out of water | ||
12 | Depth, bathymetric | Bathy depth | m | Ólafsdóttir, Anna H | Trawl in water | |
13 | Depth, bathymetric | Bathy depth | m | Ólafsdóttir, Anna H | Trawl out of water | |
14 | Towing speed | Towing speed | kn | Ólafsdóttir, Anna H | At tow depth | |
15 | Trawling time | Trawl t | min | Ólafsdóttir, Anna H | At tow depth | |
16 | Trawling distance | Trawling dis | nmi | Ólafsdóttir, Anna H | At tow depth | |
17 | Trawl vertical opening | Trawl v open | m | Ólafsdóttir, Anna H | At tow depth | |
18 | Trawl door horizontal opening | Trawl door h open | m | Ólafsdóttir, Anna H | At tow depth | |
19 | Trawl headline depth | Trawl headline depth | m | Ólafsdóttir, Anna H | Tow begins | |
20 | Trawl headline depth | Trawl headline depth | m | Ólafsdóttir, Anna H | Tow ends | |
21 | DEPTH, water | Depth water | m | Ólafsdóttir, Anna H | Calculated average/mean values | Geocode |
22 | Code | Code | Ólafsdóttir, Anna H | Fishing gear type (MFRI code) | ||
23 | Mesh size | Mesh size | mm | Ólafsdóttir, Anna H | Codend meshsize | |
24 | Sweeps length | Sweeps l | m | Ólafsdóttir, Anna H | ||
25 | Wire length | Wire length | m | Ólafsdóttir, Anna H | Wrap wire length | |
26 | Wind speed | ff | m/s | Ólafsdóttir, Anna H | ||
27 | Wind direction | dd | deg | Ólafsdóttir, Anna H | ||
28 | Cloud cover | Cloud cov | okta | Ólafsdóttir, Anna H | Scale 1 - 8 | |
29 | Temperature, water | Temp | °C | Ólafsdóttir, Anna H | At 5 m depth from surface | |
30 | Temperature, air | TTT | °C | Ólafsdóttir, Anna H | At sea level | |
31 | Pressure, atmospheric | PPPP | hPa | Ólafsdóttir, Anna H | ||
32 | Taxon/taxa, unique identification | Taxa UID | Ólafsdóttir, Anna H | Visual identification (VID) | ||
33 | Taxon/taxa, unique identification (Semantic URI) | Taxa UID (Semantic URI) | Ólafsdóttir, Anna H | Visual identification (VID) | ||
34 | Taxon/taxa, unique identification (URI) | Taxa UID (URI) | Ólafsdóttir, Anna H | Visual identification (VID) | ||
35 | Length | l | cm | Ólafsdóttir, Anna H | Fish measuring board | |
36 | Weight, total, wet | w tot wet | g | Ólafsdóttir, Anna H | Fish, wet weighted | |
37 | Sex | Sex | Ólafsdóttir, Anna H | Visual identification (VID) | ||
38 | Gonadal stage | Gon stg | Ólafsdóttir, Anna H | Visual identification (VID) | ||
39 | Liver, wet mass | Liver wm | g | Ólafsdóttir, Anna H | Weighted | |
40 | Stomach, wet mass | Stom wm | g | Ólafsdóttir, Anna H | Weighted | |
41 | Age | Age | a | Ólafsdóttir, Anna H | Otolith reader | Age of fish in years |
42 | Mass | Mass | kg | Ólafsdóttir, Anna H | Weighted | Total weight per species per station |
43 | Number of individuals | Ind No | # | Ólafsdóttir, Anna H | Counting, visual | Specimen length measured per species per station |
44 | Number of individuals | Ind No | # | Ólafsdóttir, Anna H | Counting, visual | Specimen aged per species per station |
45 | Number of individuals | Ind No | # | Ólafsdóttir, Anna H | Counting, visual | Specimen weighted per species per station |
46 | Identification | ID | Ólafsdóttir, Anna H | Sample identification number (MFRI database) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
165502 data points
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